Regardless of the type of car you drive or where you drive it, by owning and operating a vehicle and driving it on public roads, your car is vulnerable to all types of losses and damages, both to yourself and to others on the road and their property. Though you’re probably most concerned with accidents, your vehicle can also be damaged by acts of weather such as falling tree limbs or monster-sized hail, vandalism or even invaded by creepy crawlers, especially if you park outside or on the street.
Comprehensive car insurance covers damages from an "act of God," or events that are not caused by a car driving into something else. An "act of God" can include things like damage from a heavy tree branch falling on your car. Since you have no control over when or why a tree branch would fall on your car, this kind of accident would be covered under your comprehensive policy.
Collision coverage has a deductible, which is the amount you pay before your coverage helps pay for your claim. You can typically choose the amount of your deductible when you buy coverage. So, if you choose a $1,000 deductible and your car is later damaged in a covered accident, you'd have to pay $1,000 toward repair costs. Your collision coverage would help pay the rest, up to your coverage limit.